Well then! *ahem*

Yo' mama's so fat even Venge can't swap her
Yo' mama's so fat she bounces outside of the *inside* of Clockwerk's cogs
Yo' mama's like assist gold - everyone gets a share
Yo mama's so horny even SK's reincarnate's not enough
Yo AM's so fat he can't even carry a ward
Yo mama's so fat people want *her* aegis
Yo mama's so loose that after Slark pounced, we never saw him again
Yo mama's so old she had the game named after her
Yo mama's so greasy wisp can't keep a tether on her
Yo mama's so fat when she walks, Earthshaker's like wdf?
Yo mama's so fat, sven's stun can't *reach* anyone else
Yo mama's so fat, Riki can't *find* the back of her

And, credit where credit is due... These were from Snuffles

Yo mama so fat, pudge eats himself
Yo mama so ugly, even KOTL wouldn't blast her
Yo mama so fat, Gyro's rocket gets confused
Yo mama so fat, Tinker blind laser himself
Yo mama so fat, Nature's Ulti only hits her
Yo mama so ugly, even Roshan wouldn't stun her
Yo mama so fat, she makes Pudge's rot look like a condensation
Yo mama so fat, Force Staff gives up
Yo mama so fat, Sven ALWAYS cleaves her
Yo mama's so fat, when BH tracks her, he finds the sun (my response: "Imagine the track gold though!")
Yo mama so fat, Chen's teleport does NOTHING, NOTHING AT ALL.